Heating unit.



B.-FALKENBURG.

HEATING UNIT.

APPLICATION FILED MAY 27, 1912. I

Patented June 1?, i913.

' porting sheet 4 to be withdrawn bent across the upper edge of the inner strip 17 and is carried directly at a slight upward angle, as clearly shown in Figs. 1 and 2, to rivet 20 which passes through one of the holes 11, and connection is thereby made between the wire 16 and a wire 21 which is secured by the rivet 20 and rises from between the plates at and 12. The other end 9 of the wire 6 rises directly above the plates 4 and 12 and soldered thereto is a wider terminal wire 22.

A disk 23 of mica having a central slot 24 is arranged at the bottom of the members 2 and 3 and the wire end 10' passes through the slot 24;. Below the wire end 10 and disk 23 is another imperforate mica disk 25 which insulates the Wire 24 from the bottom of the casing l. The heat generated by the coiled wire 6 passes through the mica and is imparted to the members 2'and 3 and the latter being of good heat conducting material conduct the heat directly to the shell 1 and thereby secure a close fit of the elements 2 and 3 with the casing 1, so that practically all of the heat is conducted without loss to the shell 1, and therefrom distributed.

If the element should burn out or require replacement it may be removed from the casing 1 and the rivets 18 and 14 removed, which will. enable the wire 6 and its supand a new one replaced between the elements 2 and 3.

It is to be noted that the only replacementrequired is that of the wire 6 and its supr porting sheet of mica 4t and the two insulating sheets 12, as the members 2 and 3 and casing 1 may be used indefinitely.

What I claim is 1. A heating unit comprising a tubular casing, a core therein consisting of two sub stantially semi-cylindrical members of heat conducting material, a sheet of insulation between said members, and wire wound on said insulating sheet between said core members.

2. A heating unit comprising a tubular casing, a core therein consisting of two substantially semi-cylindrical members of heat conducting material, a sheet of insulation between said members, and wire wound on said insulating sheet between said core members, there being a conduit formed between the wall of the casing and said core, and a conductor passed through said conduit. at the top and connected to the lower end of said resistance wire.

3. A heating unit comprising a tubular casing, a core therein consisting of two members of heat conducting material, a sheet of insulating material between said members, resistance wire wound on said insulating material, said insulating material extending above said members, one of said members being formed with a longitudinal groove, and

a conductor lying in said groove and insulated therefrom and connected with lower end of said wire, the upper end of said wire being extended inwardly and connected with said resistance sheet.

4. A heating unit comprising a tubular casing of heat conducting material, a pair of semi-cylindrical members within said casing consisting of a heat conducting material, resistance wire arranged between said members and insulated therefrom, one of said members having a longitudinal groove, a conductor extending through said groove, a connection between said conductor and the lower end of said resistance wire extending across the bottom of one of said members, and a disk of'insulating material between said latter member and said connection and another disk of insulating material between said connection and the bottom of said casing.

5. A heating unit comprising a tubular casing, a pair of semi-cylindrical members within said casing, resistance wire arranged between said members and insulated therefrom, one of said members having a longitudinal groove, strips of insulating material of the width of said groove lying therein, and a conductor of less width than said groove secured to said insulating strips and extending along the groove, the lower end of said conductor being connected with said resistance wire, the upper end of said conductor forming one terminal and the upper end of the resistance wire forming another terminal.

(5. A heating unit comprising a tubular easing, a pair of semi-cylindrical members within said casing, resistance wire between said members and insulated therefrom, one of said members having a longitudinal groove, a conductor of less width than the groove extending through the groove and connected with the lower end of the resistance wire, insulating strips of the same width as the groove lying therein, rivets securing said resistance strips to said conductor, and other insulating strips of the width of the groove lying outside of said rivets.

7. A heating unit comprising a tubularcasing, a pair of semi-cylindrical members within said casing, resistance wire between said members and insulated therefrom, one of said members having a longitudinal groove, a conductor of less width than the groove extending through the groove and connected with the lower end of the resistance wire, insulating strips of the same width as the groove lying therein, rivets securing said resistance strips to said conductor, and other insulating strips of the width of the groove lying outside of said rivets, and a sheet of insulation on which the resistance wire is wound extending above the said members, said conductor being extended from the upper end of said groove to said projecting insulation and secured thereto.

8. A heating unit comprising tWo substantially semi-cylindrical nienlhers of heat conducting material, an eleetrit-zil resistance lbefween said members and 1 ying against one face only of each member, and means for holding said members together with said resistance between them.

In testimony whereof, I have hereunto set my hand at Ontario, California, this 11th day of April, 1912.

BJA ENE FA LKENBUR G.

In presence of O. H. Boo'rH, FRANKLIN Boo'rn. 

